LG 42LM3400 (CHASSIS:LJ21C) Service Manual ▷ View online
- 21 -
No Sound
Check The Input Sourse
Check The Input/Output
Of IC501
Re-soldering or
Change the defect part
Fail
Pass
Pass
Check The Speaker
Change Speaker
Fail
Check The Speaker Wire
Pass
Change The Source Input
Fail
- 22 -
BLOCK DIAGRAM
Et
he
rne
t
R
G
B
P
C
S
P
D
IF
Co
m
po
ne
nt
2
H
D
MI
1
/2
(D
V
I)
TD
S
N
TD
S
N
-
-
B
0
0
1
F
B
0
0
1
F
P
C/
D
V
I A
ud
i I
n
IF
+
/-
TU
_C
VB
S
SI
F
L/
R
LG
E2
11
2-
T8
IC
1
0
1
LG
E2
11
2-
T8
IC
1
0
1
S
ER
IA
L F
LA
S
H
IC
1
4
0
1
(
8
M
b
it
)
M
X
2
5
L8
0
0
5
M
2
I
LV
D
S
(F
H
D
/5
0
H
z)
A
ud
io
A
MP
N
TP
7
5
0
0
U
S
B
1
D
P/
D
M
S
P
K
L
/R
X
-t
al
2
4
M
FP
C
(5
1
P
)
I2
S
SP
D
IF
RG
B,
H
/V
SY
N
C
R
ea
r
D
D
C/
D
[0
:2
]/
C
K/
H
PD
D
D
R3
A
dd
.
D
D
R3
D
at
a
SP
I
Si
de
N
A
N
D
F
LA
S
H
IC
1
0
2
(
1
G
b
it
)
TM
D
S
H
D
MI
3
D
D
R
3
1
G
b
IC
1
2
0
2
H
5
TQ
1
G
6
3D
FR
D
D
R
3
1
G
b
IC
1
2
0
1
H
5
TQ
1
G
6
3D
FR
C
O
N
TR
O
L
IR
&
L
ED
/
S
O
FT
T
O
U
C
H
(T
A
C
T
S
W
IT
C
H
)
S
E
N
S
O
R
_S
C
L
/S
D
A
L
E
D
_R
K
E
Y
1
K
E
Y
2
IR
S
O
F
T
T
O
U
C
H
_S
C
L
/S
D
A
EEPR
O
M
A
T2
4C
25
6C
-S
SH
L-
T
IC
1
0
4
25
6
K
bi
t
I2
C
EP
H
Y
Co
m
po
ne
nt
1
&
A
V
Y/
Pb
/P
r,
L
/R
CV
BS
,
Y/
Pb
/P
r,
L
/R
TU
_S
W
- 23 -
200
800
820
530
550
540
521
400
810
120
LV
1
910
900
A7
* S
et
+
S
ta
nd
* S
ta
nd
B
as
e
+
Bo
dy
A1
0
AG1
HO
M
E
/
A2
2
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
30
0
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